<template>
  <div >
      <!-- 顶部滑动条区域 -->
    <div id="slider" class="mui-slider">
        <div id="sliderSegmentedControl" class="mui-scroll-wrapper mui-slider-indicator mui-segmented-control mui-segmented-control-inverted">
            <div class="mui-scroll">
                <a :class="['mui-control-item',item.id==0?'mui-active':'']" v-for="item in cates" :key="item.id" @click="getPhotoListByCateId(item.id)">
                    {{item.title}}
                </a>

            </div>
        </div>
    </div>
    <!-- 图片列表区域 -->
    <ul class="photo-list">
        <router-link v-for="item in list" :key="item.id" :to="'/home/photoinfo/'+item.id" tag="li">
            <img v-lazy="item.img_url">
            <div class="info">
                <h1 class="info-title">{{item.title}}</h1>
                <div class="info-body">{{item.zhaiyao}}</div>
            </div>
        </router-link>
    </ul>
  </div>
</template>

<script>
import mui from '../../lib/mui/js/mui.min.js'
import {Toast} from 'mint-ui'

export default {
  created(){
      this.getAllCategory()
      this.getPhotoListByCateId(0)//默认进入页面就主动请求所有图片列表的数据
  },
  mounted(){//当组件中的DOM结构被渲染好了并放到页面中后执行该函数
    //如果要操作元素，最好在mounted函数中
    mui('.mui-scroll-wrapper').scroll({
        deceleration: 0.0005 //flick 减速系数，系数越大，滚动速度越慢，滚动距离越小，默认值0.0006
    });
  },
  data(){
      return {
          cates:[],//图片分类
          list:[]//图片列表
      }
  },
  methods:{
    getAllCategory(){//获取所有的图片分类
        this.$axios({
            method:'get',
            url:'/api/getimgcategory'
            }).then((response) =>{          //这里使用了ES6的语法
                //console.log(response)       //请求成功返回的数据
                if(response.data.status===0){
                    response.data.message.unshift({title:'全部',id:0})//手动拼接出完整的分类
                    this.cates = response.data.message
                }else{
                    Toast('获取图片分类失败！')
                }
            }).catch((error) =>{
                console.log(error)       //请求失败返回的数据
        })
    },
    getPhotoListByCateId(cateId){//根据分类id获取图片列表
        this.$axios({
            method:'get',
            url:'/api/getimages/'+cateId
            }).then((response) =>{          //这里使用了ES6的语法
                //console.log(response)       //请求成功返回的数据
                if(response.data.status===0){
                    this.list = response.data.message
                }else{
                    Toast('获取图片列表失败！')
                }
            }).catch((error) =>{
                console.log(error)       //请求失败返回的数据
        })
    }
  }
}
</script>

<style lang="scss" scoped>
* {
    touch-action:pan-y;
 }
 .photo-list{
     list-style: none;
     margin: 0;
     padding: 10px;
     padding-bottom: 0;
     li{
        background-color: #ccc;
        text-align: center;
        margin-bottom: 10px;
        box-shadow: 0 0 9px #999;
        position: relative;
        img{
            width: 100%;
            vertical-align: middle;
        }
        img[lazy=loading] {
        width: 40px;
        height: 300px;
        margin: auto;
        }
     }
 }
 .info{
     color: white;
     text-align: left;
     position: absolute;
     bottom: 0;
     background-color: rgba(0,0,0,0.4);
     max-height: 84px;
     .info-title{
         font-size: 14px;
     }
     .info-body{
         font-size: 13px;
     }
 }

</style>
